Daeitjs hotjghtolsr



(No Model.)v

D HOUGHTON LATHE- CENTER GRINDING- MAGHINE.

Patented Jan; 22, 1884-.

- I UNITE-o TATES PATENT omen.

DARIUS HOUGHTON, or siiowHEeAN, MAI-NE.

LATII-IE-CENTER-GRINDING MACHINE.

SPECIFICATION forming" part "of Letters Patent No. 292,227, dated January 22, 1884."

' Application filed May 31, 1883. (No model.)

To aZZ whom it may concern:

Be it known that I, DARIUS HOUGHTON, a citizen of the United States, residing at Skowhegan, in the county of Somerset and State of Maine, have invented a new and useful Improvement in Lathe Center Grinding Machines, of which the following is a specification; and I do not know or believe the same has been in public use or on sale in the United States for more than two application.

My invention relates to machines for grindyears prior'to this ing the hardened steel centers of lathes used for turning metals, when, by using, they become worn to an imperfect shape.

My object in this invention is to connect and disconnect the machine with the face-plate of the lathe in such way as shall require less time and skill than the machines now in use,

using the motion of the face-plate to give thenecessary motion to the grinding-machine. I

attain this object by the mechanism illustrat ed in the accompanying drawings, in which.

Figure 1 is a plan showing the machine complete, attached to the lathe with such parts of the lathe as are necessary to show the position of the machine when in operation. Figs. 2, 3, and 4 are detached parts-of the machine.

In Fig. 1, Ais the main spindle or arbor of a common lathe. v

B is the face-plate, and O is the center.

Dotted lines WV show the position of the track on the latliebed, on which the carriage runs when the lathe is in use.

Dotted lines X show the position of thetrack on the lathe-carriage on which the tool-holder D E F and Z is moved in adjusting the tool to the work.

H is the frame of the machine, (shown detached in Fig. 2,) and is secured to the toolholder by a set-screw, Z, the same as the tool is secured in the ordinary use of the lathe.

ing-machine is to be used, is attached to the face-plate and secured by nuts P 1 Its use is to cover the holes in the face-plate and make a smooth surface for the friction-wheel L to run against.

L is a bevel-edged wheel, of any substance suitable for friction-wheels.

the collar into groove S.

U U are bearings, in which shaft Y revolves.

V V are collars secured to shaft Y with setscrews, to prevent motion of the shaft endwise when the machine is in operation, and when the machine is being attached to the lathe they can be loosed on the shaft by means of the setscrews, and the shaft can be moved endwise through the bearings U U to such place as shall bring the emery-wheel J the right distance from face-plate B to reach the point of center G. This adjustment is necessary, be cause lathe-centers are not all of the same length.

I is a shaft revolving in bearings T T, and to which is attached emery-wheel J, pulley K, and collar Q. Collar Q is loosely fitted to shaft I, and prevented from moving endwise on shaft bya pin, R, which projects on the inside of (Shown in Fig. 4.) This collar is used to move the shaft endwise when in operation, to prevent any irregularities in the emery-wheel from grinding corresponding irregularities in the center. In practical operation, after securing the machine to tool-holder, friction-wheel L is broughtin contact with and pressed against friction-wheel M, and emery-wheel J is brought in contact with center 0, at the will of the operator, by the mechanism found on all lathes for moving the toolholder lengthwise and 'of the faceplate is transmitted through friction-wheel L, shaft Y, pulley O, belt N, pulleyK, shaft I, to emery-wheel J, and the rev- M is a smooth ring, of any substance suitable for friction-wheels, which, when the grindolutions multiplied by friction-wheel M; and pulley Q being larger than friction-wheel L, and pulley K giving ;the necessary speed to the emery-wheel, then by moving the toolholder, the emery-wheel is kept in contact with the lathe-center until it. is ground to proper shape and position.

I make no claim to originality of the idea of grinding hardened centers with emery-wheels In alathe-center-grinding machine, the combination, with the face-plate of the lathe, of I 5 the plane faced. friction wheel M, secured thereto, and the friction-wheel L and its shaft, with means for transmitting the motion therefrom to the grinding-wheel, as and for the purpose set forth.

DARIUS HOUGHTON.

\Vitnesses:

J. M. STINCHFIELD, HENRY GRAVES. 

